how to convert char type to 16 binary string

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how to convert char type to 16 binary string?
for example as below:

if variable temp is char type,and it's ini value is 255,
i wanne get "FF".

so how to convert ?
thanks for relpy.

Posted 10-Jan-16 21:19pm

xuyunhai

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Sergey Alexandrovich Kryukov 11-Jan-16 10:36am

What does it mean, "16 binary string"? :-)
—SA

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CPallini · Answer 1 · 2016-01-10T21:31:00

Solution 1

You may use sprintf[^] (or printf, depending on your needs for such a purpose), e.g.

C

#include <stdio.h>

int main()
{
  unsigned char u = 255;

  printf("%02X\n", u);

  return 0;
}

You might as well code an ad hoc function yourself.

Posted 10-Jan-16 21:31pm

CPallini

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xuyunhai 11-Jan-16 3:51am

int itemp = (int)recbuf;
char *temp = 0;
itoa(itemp,temp,16);

recbuf is unsigned char array,why i can't normal run and throw exception?
thanks.

CPallini 11-Jan-16 3:55am

You got an exception because you have allocated NO memory for temp.
If you want to show each received character then you have to do something like
int itemp = recbuf[k]; // itemp is 0..255
char temp[3]; // two hexadecimal digits plus string terminator
itoa(itemp, temp); // now temp holds the string representation of recbuf[k].